/* * Sony OpenMG (OMA) demuxer * * Copyright (c) 2008 Maxim Poliakovski * 2008 Benjamin Larsson * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file oma.c * This is a demuxer for Sony OpenMG Music files * * Known file extensions: ".oma", "aa3" * The format of such files consists of three parts: * - "ea3" header carrying overall info and metadata. * - "EA3" header is a Sony-specific header containing information about * the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA), * codec specific info (packet size, sample rate, channels and so on) * and DRM related info (file encryption, content id). * - Sound data organized in packets follow the EA3 header * (can be encrypted using the Sony DRM!). * * LIMITATIONS: This version supports only plain (unencrypted) OMA files. * If any DRM-protected (encrypted) file is encountered you will get the * corresponding error message. Try to remove the encryption using any * Sony software (for example SonicStage). * CODEC SUPPORT: Only ATRAC3 codec is currently supported! */ #include #include #include #include #include "platform.h" #include "metadata.h" #include "metadata_parsers.h" #define EA3_HEADER_SIZE 96 #if 0 #define DEBUGF printf #else #define DEBUGF(...) #endif /* Various helper macros taken from ffmpeg for reading * * and writing buffers with a specified endianess. */ # define AV_RB16(x) \ ((((const uint8_t*)(x))[0] << 8) | \ ((const uint8_t*)(x))[1]) # define AV_RB24(x) \ ((((const uint8_t*)(x))[0] << 16) | \ (((const uint8_t*)(x))[1] << 8) | \ ((const uint8_t*)(x))[2]) # define AV_RB32(x) \ ((((const uint8_t*)(x))[0] << 24) | \ (((const uint8_t*)(x))[1] << 16) | \ (((const uint8_t*)(x))[2] << 8) | \ ((const uint8_t*)(x))[3]) # define AV_WL32(p, d) do { \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ ((uint8_t*)(p))[2] = (d)>>16; \ ((uint8_t*)(p))[3] = (d)>>24; \ } while(0) # define AV_WL16(p, d) do { \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ } while(0) /* Different codecs that could be present in a Sony OMA * * container file. */ enum { OMA_CODECID_ATRAC3 = 0, OMA_CODECID_ATRAC3P = 1, OMA_CODECID_MP3 = 3, OMA_CODECID_LPCM = 4, OMA_CODECID_WMA = 5, }; /* FIXME: This functions currently read different file * * parameters required for decoding. It still * * does not read the metadata - which should be * * present in the ea3 (first) header. The * * metadata in ea3 is stored as a variation of * * the ID3v2 metadata format. */ static int oma_read_header(int fd, struct mp3entry* id3) { static const uint16_t srate_tab[6] = {320,441,480,882,960,0}; int ret, ea3_taglen, EA3_pos, jsflag; uint32_t codec_params; int16_t eid; uint8_t buf[EA3_HEADER_SIZE]; ret = read(fd, buf, 10); if (ret != 10) return -1; ea3_taglen = ((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f); EA3_pos = ea3_taglen + 10; if (buf[5] & 0x10) EA3_pos += 10; lseek(fd, EA3_pos, SEEK_SET); ret = read(fd, buf, EA3_HEADER_SIZE); if (ret != EA3_HEADER_SIZE) return -1; if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) { DEBUGF("Couldn't find the EA3 header !\n"); return -1; } eid = AV_RB16(&buf[6]); if (eid != -1 && eid != -128) { DEBUGF("Encrypted file! Eid: %d\n", eid); return -1; } codec_params = AV_RB24(&buf[33]); switch (buf[32]) { case OMA_CODECID_ATRAC3: id3->frequency = srate_tab[(codec_params >> 13) & 7]*100; if (id3->frequency != 44100) { DEBUGF("Unsupported sample rate, send sample file to developers: %d\n", id3->frequency); return -1; } id3->bytesperframe = (codec_params & 0x3FF) * 8; id3->codectype = AFMT_OMA_ATRAC3; jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */ id3->bitrate = id3->frequency * id3->bytesperframe * 8 / (1024 * 1000); AV_WL16(&id3->id3v2buf[0], 1); // always 1 AV_WL32(&id3->id3v2buf[2], id3->frequency); // samples rate AV_WL16(&id3->id3v2buf[6], jsflag); // coding mode AV_WL16(&id3->id3v2buf[8], jsflag); // coding mode AV_WL16(&id3->id3v2buf[10], 1); // always 1 AV_WL16(&id3->id3v2buf[12], 0); // always 0 DEBUGF("sample_rate = %d\n", id3->frequency); DEBUGF("frame_size = %d\n", id3->bytesperframe); DEBUGF("stereo_coding_mode = %d\n", jsflag); break; default: DEBUGF("Unsupported codec %d!\n",buf[32]); return -1; break; } /* Store the the offset of the first audio frame, to be able to seek to it * * directly in atrac3_oma.codec. */ id3->first_frame_offset = EA3_pos + EA3_HEADER_SIZE; return 0; } bool get_oma_metadata(int fd, struct mp3entry* id3) { if(oma_read_header(fd, id3) < 0) return false; /* Currently, there's no means of knowing the duration * * directly from the the file so we calculate it. */ id3->filesize = filesize(fd); id3->length = ((id3->filesize - id3->first_frame_offset) * 8) / id3->bitrate; return true; }